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Secureseed* updates to user manual. #381

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Jan 10, 2023
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Secureseed* updates to user manual. #381

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15 changes: 15 additions & 0 deletions docs/user_manual/source/control_status_registers.rst
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Expand Up @@ -2118,6 +2118,11 @@ Detailed:

The ``secureseed0`` CSR contains seed data for LFSR0.

.. note::
Only the read-modify-write (swap/CSRRW) operation is useful for ``secureseed0``.
The behavior of the non-CSRRW variants (i.e. CSRRS/C, CSRRWI, CSRRS/CI) and CSRRW variants with **rs1** = **x0** on ``secureseed0`` are implementation-defined.
|corev| will treat such instructions as illegal instructions.

Secure Seed 1
~~~~~~~~~~~~~
CSR Address: 0xBFA
Expand All @@ -2138,6 +2143,11 @@ Detailed:

The ``secureseed1`` CSR contains seed data for LFSR1.

.. note::
Only the read-modify-write (swap/CSRRW) operation is useful for ``secureseed1``.
The behavior of the non-CSRRW variants (i.e. CSRRS/C, CSRRWI, CSRRS/CI) and CSRRW variants with **rs1** = **x0** on ``secureseed1`` are implementation-defined.
|corev| will treat such instructions as illegal instructions.

Secure Seed 2
~~~~~~~~~~~~~
CSR Address: 0xBFC
Expand All @@ -2158,6 +2168,11 @@ Detailed:

The ``secureseed2`` CSR contains seed data for LFSR2.

.. note::
Only the read-modify-write (swap/CSRRW) operation is useful for ``secureseed2``.
The behavior of the non-CSRRW variants (i.e. CSRRS/C, CSRRWI, CSRRS/CI) and CSRRW variants with **rs1** = **x0** on ``secureseed2`` are implementation-defined.
|corev| will treat such instructions as illegal instructions.

Machine Vendor ID (``mvendorid``)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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